Diagnostics of drilling in numerically controlled machine tools

Cutting-tool vibration is considered on the basis of existing physical notions regarding forced, free, and self-exciting vibration in a cutting system that consists of interacting tool and workpiece subsystems. A vibrodiagnostic system is studied experimentally in the drilling of a small-diameter by means of an NI CompactDAQ measuring complex.     

Monitoring of machine tools

Means of increasing machine-tool reliability are considered. In particular, systems for monitoring machine tools are developed on the basis of the e-Mind Machine module and an expert system for flexible maintenance.     

机床的工业设计——“机床产品创新与设计”专题(十一)

1概述我国机床业界普遍存在一种观点,认为机床的价值仅由其加工能力和效率决定。因此,机床制造商对其机床产品进行工业设计,往往模仿消费品制造业的作风,在机床产品机械设计工作完成后,再对设计方案进行局部修饰和外观美化。无可否认,美是工业设计的一部分,回顾工业革命时期的历史可以发现,机械产品的外观造型,曾     

数控机床维修举例

数控机床采用数字控制系统 ,能够实现多轴联动 ,实现三维形体的加工 ,加工出几何形状复杂的零件 ,从而备受人们的青睐。近年来随着数控机床的广泛应用 ,人们已经对数控技术有了相当的了解 ,对于一些常见的故障也能进行排除 ,从而提高了机床的使用率 ,但是对一些不常见的故障还是感到比较棘手。下面介绍笔者近年来在从事数控机床维修中遇到的几个例子 ,供大家参考。大家知道 ,旋转编码器或光栅尺在数控机床上一般作为位置反馈元件使用 ,机床每次开机后都要寻找参考点 ,以确定机床的坐标点 ,即我们常说的“回零”。旋转编码器出现故障后 ,一般…     

Modular design of machine tools

Modular design principles are outlined for technological systems, with attention to the type of components, their manufacturing technology, and the organization of the production process.     

Monitoring and control of tools in multifunctional machine tools

Machining centers and multifunctional machine tools are used in computerized integrated production. They are equipped with a large number of cutting tools for production of a specific batch of parts. In such automatic systems, monitoring and control systems replace the human operator. Monitoring of the state of machining systems is essential today in monitoring and control of the machining operations [1, 2]. It is important to create monitoring systems to support reliable tool operation in multifunctional machine tools. The goals of such systems are to minimize the damage from serious disruption of tool operation and to ensure timely tool replacement. To that end the multifunctional machine tools and/or the numerical control system must be equipped with sensors and various monitoring devices. A strategy must be developed for the prevention of disruption of the machining process and tool failure.     

2002年中国机床工具出口数量金额

┏━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓┃┃合计┃合计中:数控┃┃┣━━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━╋━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┫┃┃数量(台) ┃与上年比较(%) ┃金额(千美元: ┃与上年比较(%) ┃数量(台) ┃与上年比较(%) ┃金额(千美元) ┃与上年比较(%) ┃┣━━━━━━━━━━╋━━━━━━━╋━━━━━━━━╋━━━…     

2002年中国机床工具进口数量金额

H I/“∥l、一/…IⅣn’I’’W Pr┏━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓┃┃合计┃合计中:数控┃┃┣━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━╋━━━━━━┳━━━━━━━━┳━━━━━━━┳━━━━━━━━┫┃┃数量(台) ┃与上年比较(%: ┃金额(千美元: ┃与上年比较(%) ┃数量(台) ┃与上年比较(%) ┃金额(千美元) ┃与上年比较(%) ┃┣━━━━━━━━━━╋━━━…     

Diagnostics of the stress-strain state of machine parts

A new real-time diagnostic method for the stress-strain state of machine parts is developed, on the basis of a carbon microplate.     

机床爬行现象的研究

了解机床爬行机理对机床的维护和改进有很大的现实意义.下文从摩擦学的角度介绍机床爬行的描述方法及危害,全面研究爬行机理,分析影响机床爬行的各个因素.     

机床的选型及安装调试

主要介绍用户在购买机床过程巾应该注意的问题及随后进行安装与调试应注意的事项。     

Precision contouring control of machine tools

Computer numerical control (CNC) machines are now widely used in the manufacturing industry. There is an increasing need for lower-costing machines capable of high precision machining. To achieve high precision machining, the motions of the axes of these machine tools need to be controlled precisely so that they follow a desired path, or contour, accurately. This paper discusses some of the factors that can affect the accuracy of the contour generated. Also discussed are some compensation approaches to compensating the geometrical errors of these machines so as to achieve precision results even with not-so-accurately build machines. Also presented and discussed are the results of approaches taken in improving contouring accuracy through the design and tuning of the machine axis controllers as well as some contour path compensation approaches.